Super Bowl XLVII champion and Baltimore Ravens head coach John Harbaugh agreed to a four-year, $28 million contract extension.

The deal, which was verified by a Ravens team source, makes him one of the highest-paid coaches in the NFL, per Jeff Zrebiec of the BaltimoreSun. Harbaugh reportedly agreed to the extension "months ago," but the news only broke out around an hour prior to Baltimore's season opener against the Denver Broncos on Thursday.

According to ESPN's Adam Schefter, "The new contract replaces the two years left on Harbaugh's previous deal, the source said. NBC Sports reported that the deal is for four years and worth nearly $7 million per season."

Schefter also adds Harbaugh becomes the third AFC North head coach to receive an extension. Mike Tomlin of the Pittsburgh Steelers received one through 2016 while Marvin Lewis of the Cincinnati Bengals was given one that runs through the 2014 season.

His extension comes on the heels of the Ravens' Super Bowl triumph last February. Since taking over the Ravens' coaching reigns in 2008, he has won at least one playoff game every year. Zrebiec also points out Harbaugh is the first NFL coach ever to reach three conference title games in his first five seasons.

His current overall regular-season record also stands at 54-26 (.675).

All of these come from a head coach with no previous college and professional football coaching experience prior to his appointment.